4000 SERIES AUTOMATIC MIXER SYSTEM MAY 1998 SECTION 4GROUP 03 SUB BPAGE 5
INSTALLATION INSTRUCTIONS MODEL 4452 AUTOMATIC MIXER
Figure 5 - Location of linking jumpers
on the 4452 card
CARD LINKING USING JUMPERS - 4452 AND 4452E ONLY
The 4000 series automatic mixer accomplishes
card-to-card linking by sharing certain informa-
tion between cards. This information can be
fully or partially accessed, dependent on need,
by installing linking jumpers. Refer to figure 5
for the location of the linking jumpers on the
4452 card. The information which can be
shared between cards is referred to as the 5
Linking Options. These options consist of the
following:
1) Discriminator information
2) Priority information
3) Digital Attenuator information
4) Main audio
5) Auxiliary audio
Each mixer card in the Model 4452 Automatic
Mixer Series has four gated inputs. In order to
produce mixers with a greater number of gated
inputs (up to 32 gated inputs in each main-
frame), the mixer cards must be linked. Linking
allows the cards to perform as a single larger
mixer in every respect.
This example makes use of 4452 cards with
Main and Aux outputs. In most systems, a card
group such as that shown in figure would have
only one 4452 card. It would be designated as
the main card, and would be placed in the fur-
thest right position of the group. The remainder
of the cards in the group would be 4452E Ex-
pansion Cards. Expansion cards are more eco-
nomical, since their Main and Aux Outputs,
which are not used, are omitted, as are their
corresponding bus jumpers.
To understand the 4000 Series linking opera-
tion we will select one of the 4452 Automatic
Mixer card inserted in a 4174 mainframe. The
shaded card in Figure 9 will be used as an ex-
ample. When the 4452 automatic mixer card
being discussed is mounted in the 4174 Main-
frame, its 5 Linking Options are available to the
other cards in the mainframe via the 4174 bus
system. Installing a shunt in the #1 position, on
eachlinking option as illustrated in Figure 10 al-
lowsthe4452 to completely link to itself.Focus-
